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Segment Information - Summary of Reportable Segments (Parenthetical) (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
Impairment charges of goodwill | kr (1,260) | kr (31,897) | kr 0
Gain on resolution of a commercial dispute | 1,900 |  |
Provisions | 11,715 | 11,706 | 11,588
Vonage Holdings Corp [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Impairment charges of goodwill | (900) | kr (31,900) | (15,300)
Others [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Provisions | (2,300) |  | (2,300)
IoT and other portfolio adjustments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Charges related to divestment of business | kr (1,000) |  | kr (1,000)

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